NIGHTMARE BEFORE CHRISTMAS MIRROR MOON (2021)

When the master of scares Jack Skellington has a dream about bringing his expertise in spookiness to the rest of the holiday worlds, he appoints Sally the official Halloween planner so he can spend his time on his newest invention. But as Sally coordinates with the Halloween Town residents, it becomes clear that something is very wrong. It's almost as if there's a secret doppelganger sneaking around behind her back! Can she get to the bottom of this mystery in time to save the celebrations?

Sally was just confronted by her clone! Or maybe she was just seeing things? She's sure Jack will know what to do, but when Sally goes to talk to him she finds him talking with her clone. Listening in on their conversation, she overhears more details about Jack's secret project, which, unbeknownst to him, may not be working the way he intended.